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Pumping oil out breather
https://www.ausmini.com/forums/viewtopic.php?f=2&t=85246		 Page 1 of 2
Author:  carter [ Sat Apr 12, 2014 3:19 pm ]
Post subject:  Pumping oil out breather
G'day fellas just a question I have recently put a motor in my car that was pulled out of one a few yrs ago because of a massive oil leak. I fixed the leak and put it in my car and now it's pumping oil out the breather in the rocker cover. Why would this be ?????
Author:  gtogreen1969 [ Sat Apr 12, 2014 5:59 pm ]
Post subject:  Re: Pumping oil out breather
Maybe getting a lot of Blowby and blocked breathers. Have you done a compression test? The original oil leak may have been linked to crankcase pressure build up.
Author:  carter [ Sat Apr 12, 2014 6:03 pm ]
Post subject:  Re: Pumping oil out breather
Original oil leak was from two stripped timing chain bolts.... Replaced the backing plate now it's good. No haven't done a compression test. There is next to no pressure coming out if the rocker cover cap.
Author:  gtogreen1969 [ Sat Apr 12, 2014 6:21 pm ]
Post subject:  Re: Pumping oil out breather
How much oil has been pumped out. How long has the engine been run for.
A little oil can drain into the breather if the rocker cover is turned upside down but this usually when adjusting tappets and not from an engine sitting for a long time. Sorry I haven't more ideas.
Author:  carter [ Sat Apr 12, 2014 7:52 pm ]
Post subject:  Re: Pumping oil out breather
It's an alloy rocker cover. Only went for its first drive about 40 mins today
Author:  Mick [ Sat Apr 12, 2014 7:57 pm ]
Post subject:  Re: Pumping oil out breather
Excessive blow by will most likely be the culprit if it hasn't done so before. This won't be as obvious at idle, but will do so under load.

What's the history of the motor, was it yours when it was in the car?
Author:  whoopspiggy [ Sat Apr 12, 2014 8:13 pm ]
Post subject:  Re: Pumping oil out breather
I had an engine that use to fill the rocker up with oil - what eventually fixed it was new cam bearings and making sure the oil feed oil hole was offset to restrict flow a bit
Author:  carter [ Sat Apr 12, 2014 8:57 pm ]
Post subject:  Re: Pumping oil out breather
It doesn't do it while it's idling I think only when under load so I don't see it.... Just the result..... Motor as in my dads mini b4 and was fine......
Author:  drmini in aust [ Mon Apr 14, 2014 9:01 pm ]
Post subject:  Re: Pumping oil out breather
If it's getting that much oil up there I'd suspect the front cam bush is fitted in arse about.
This can result in a continuous oil feed to the valve gear, instead of a short pulse every cam revolution as per normal.
Author:  i got a mini [ Tue Apr 15, 2014 5:14 am ]
Post subject:  Re: Pumping oil out breather
We gave it a compression test and the results weren't good around about 90 psi in one and the others like 85 ect tipped oil in one cylinder gave it another test 125 so it's rings :(
Author:  drmini in aust [ Tue Apr 15, 2014 7:07 am ]
Post subject:  Re: Pumping oil out breather
i got a mini wrote:
We gave it a compression test and the results weren't good around about 90 psi in one and the others like 85 ect tipped oil in one cylinder gave it another test 125 so it's rings :(

Fix it properly- bore it and fit new oversize pistons & rings. Rings alone don't fix an A series for long, as you will find the bores are worn too.
Author:  1310/71 [ Tue Apr 15, 2014 7:56 am ]
Post subject:  Re: Pumping oil out breather
drmini in aust wrote:
i got a mini wrote:
We gave it a compression test and the results weren't good around about 90 psi in one and the others like 85 ect tipped oil in one cylinder gave it another test 125 so it's rings :(

Fix it properly- bore it and fit new oversize pistons & rings. Rings alone don't fix an A series for long, as you will find the bores are worn too.



second that. I spent a couple of years chasing issues on a supposedly rebuilt engine (I bought it rebuilt). Don't doubt it had been re-ringed, but that's not the same as being rebuilt.
KB
Author:  gtogreen1969 [ Tue Apr 15, 2014 10:39 am ]
Post subject:  Re: Pumping oil out breather
Sorry to hear that your oil leak has now escalated to an expensive rebuild.
Author:  carter [ Tue Apr 15, 2014 1:18 pm ]
Post subject:  Re: Pumping oil out breather
Thanks for all your help again guys. Thinking about retiring my daily and concentrating on my cooper s. That will take a good while though......
Author:  gtogreen1969 [ Tue Apr 15, 2014 4:22 pm ]
Post subject:  Re: Pumping oil out breather
carter wrote:
Thanks for all your help again guys. Thinking about retiring my daily and concentrating on my cooper s. That will take a good while though......


It might keep on going for a while. Have you thought of running a catch can for the oily fumes. I have had many cars that have needed a rebuild and gotten away with using them for quite some time until I had the time and money. Just check and top up the oil regularly and pull the spark plugs out and clean them when it starts to run rough.

You would be extremely lucky to get away with just a re-ring on an A-series. Almost every thing inside needs checking and replacing, cylinders wear out quickly, bearings usually need replacing, definitely a new oil pump is needed , gearbox has to be checked over as well, new seals and gaskets. While it is all apart you may want to drop a new clutch in it so that you don't have to go back in later. Don't forget to avoid the "more HP buzz" That will get real expensive.

Everyone that's rebuilt an A series will tend to more than actually needed for piece of mind. The worst thing would be to give it a budget rebuild then 5000km down the track the part you didn't replace blows up.

My opinion is to drive it into the ground while you spend your money on getting the Cooper S on the road.

Keep us posted on the progress of the Cooper S.
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